Bleeding means for fluid pressure mechanism



Sept. 15, 1936. B. DICK BLEEDING MEANS FOR FLUID PRESSURE MECHANISM Filed April 20, 1935 IN VENT OR. %umvs a/c/r BY ATTORNEY.

Patented Sept. 15, 1936 Q UNITED STATES PATENT OFFICE 2,054,853 BLEEDING MEANS FOR FLUID PRESSURE MECHANISM Burns Dick, Ferguson, Mo., assignor to Wagner Electric Corporation, St. Louis, Mo., a corporation oi' Delaware Application April 20, 1935, Serial No. 17,375 Claims. (cl. Gil-54.6)

; My invention relates to improvements in fluid cylindrical portion i and a threaded extension pressure systems and more particularly to an I 6 which is adapted to cooperate with the threadimproved connecting means between the fluid ed passage Ill. When the extension is in threadsupply conduit and the wheel cylinder of a hyed relation to the threads of passage I 0, the draulic brake actuating system. cylindrical portion I5 is received in recess ll, 6 One of the objects of my invention is to so and when the terminal member is screwed in combine a bleeder passage and a supply conduit tightly, the end surface of the cylindrical porconnecting means for a fluid receiving chamber tion engages, and has a liquid-tight fit, with the that the bleeder passage may be controlled by shoulder l2, thereby insuring a liquid-tight joint the connecting means. as shown in Figure 1A. The supply conduit l3 10 h r j t f my inv nti n is o o conis connected with the master cylinder device I 1 Strllct the connecting means between a pp y of the braking system for creating pressure on conduit and a fluid receiving chamber that a the liquid to thereby move the brake actuating portion thereof forms a valve means for the pistons in opposite directions. bleeder P age of the chamber. In hydraulic brake actuating systems it is nec- Other objects of my invention will become essary to provide means for bleeding the sysapparent from the following description taken tems to eliminate any air therein. This bleedin connection with the accompanying drawing, ing operation must be performed when the sysshowing two embodiments th r f. n w i Fi tem is initially filled with fluid and possibly also ure 1 is a partial r st n View f a upduring use of the same ii. air should by chance be p y conduit n the W l cylinder assembly of a drawn into the system. In accordance with my ydraulic brake system in which my inventi n invention I control this bleeding passage by is embodied; Figure 1A is a partial view similar 'means of the terminal member of the fluid supto Figure 1 showing the parts in another relaply conduit, tion; and Figure 2 is a partial cross-sectional A passage I8 is formed in the extension 9, the View of a modified construction. inner end of which is in communication with t u I ave c s n a P i n o a hydrauchamber ii and the outer end 01' which opens into i ra e a tuat n syst m to il ust a y nv na recess l I through an annular recess it. comtion, it is to be understood that it may be 'emmunicatlon from the annular recess II to the bodied in other types of fluid systems. exterior is provided by a passage 20, the outer R f rring o Fi ures 1 and 1A in detail. the end of which receives a nipple 2i for convennumeral l indicates the cylinder of a hydraulic I iently attaching a rubber tube 22 for conveying brake actuating v n w h is Positioned 8- the liquid to a suitable receptacle when the syspair of oppositely movable pistons 2 and 3 adapttem is bled. The flow of liquid from passage ed to actuate a pair of brake shoes 4 and 5, a I! to passage 20 is controlled by engaging and p vi w f th en f the ho w b only being disengaging the end surface of the cylindrical shown. The cylinder is s red to h fixed l portion IS on the conduit terminal with shoulport or backing plate 6 of the brake in a wellder [2, n wn mann The p t s a p vided w th g In initially filling the system with a suitable e u u l p k n c ps 7 nd the pistons and operating liquid the master cylinder device I1 is 40 ylinder wall form a chamber 8 for receiving first filled with liquid which is then forced quid de p e whereby t tons a through the system by operating the master be moved in opposite directions to actuate the cylinder as a pump vin a well-known manner. brake. When the terminal member is in the position The cylin r I is provided with an integral shown in Figure 1, liquid forced througlsthe sysextension 9 which projects through a suitable tem by the master cylinder device will flow into p i g in th backing p ate 6. Thi t n n chamber a from the supply conduit through passhas form d h in a t d d passa e 0 n age It and then out of the chambertothe exterior end of which opens into the chamber and the through passage is, recess II, and passage 20, asv other end of which opens into a cylindrical reindicated by the arrow. when all the air has cess H in the end of the extension, thereby i'ormbeen eliminated from the system it is only necesing an annular shoulder l2. sary, in order to prevent the flow of f uid from; The liquid supply conduit l3 for conveying the chamber to the exterior, to screw up the sup liquid under pressure to the cylinder, has secured ply conduit terminal member by means 01- the thereto a terminal member It provided with a wrench-receiving portion 24. This will place the gagement with shoulder end of the cylindrical portion II! in sealing enl2 as shown in Figure 1A. Thus the fluid supply conduit will be in fluid-tight engagement with passage l9. and communication between passages l8 and 20 will be cut oil.

When it is desired to bleed the system any time after the system has been fllled with liquid, it will only be necessary to unscrew the conduit terminal member suiflciently to disengage the end surface of the cylindrical portion l5 from the shoulder l8, thereby placing passage 18 in communication with passage 20. In order to decrease the possibility of leakage between the cylindrical portion [5 and the wall of the recess II when the terminal member is unscrewed, a rubber packing ring 23 may be employed as shown.

In Figure 2 I have shown a modification or the structure of Figure 1. The cylinder l is similar to that previously described and is provided with an integral extension 9 which extends through an opening in the backing plate 6. The cylinder wall is provided with a passage 25 which communicates with a cylindrical chamber 26 in the extension 9, this chamber being of larger diameter than passage 25. The supply conduit l3 carries a terminal member 21 which is provided with an annular shoulder 28 and a hollow extension 29 in communication with the conduit. The diameter of the annular shoulder 28 is slightly less than the diameter of the chamber 26 and is adapted to engage the annular shoulder 30 formed by passage 25 entering the chamber 26. The extension 29 of the terminal member is of smaller external diameter than the diameter of passage 25 and is adapted to be received in passage 25. The length of the extension 29 is such that it will extend into The the interior of chamber 6 of the cylinder. wall of chamber 26 is threaded for cooperation with a threaded nut 3| surrounding-the terminal member 21 whereby the shoulder 28 may be forced against shoulder 30 to thereby seal the connection between the conduit terminal and the cylinder wall. The extension 9 is provided with a passage 32 for placing chamber 26 in communication with the exterior. The end of passage 32 carries a suitable nipple member 33 for receiving the rubber tube.

In the modification, when it is desired to bleed the system the nut 3! is unscrewed to the position shown, thereby disengaging shoulders 28 and 30. Under these conditions liquid from the master cylinder may be forced through conduit I3 and the hollow extension 29 or the terminal member into chamber 3 and then out through passages 25, 26, and 32. When the bleeding operation is completed, the terminal member is sealed to the cylinder wall by screwing down nut 3|, thereby causing shoulder 28 to sealingly engage shoulder 30.

The construction shown in Figure 2 very efllciently eliminates air from chamber 8 during the bleeding operation. The liquid under pressure entering chamber 8 through extension 29 will flow across the cylinder and impinge on the opposite wall where it will divide and flow back along the walls of the cylinder to passage 25, as indicated by the arrows. Thus any air along the 'cylinder walls will be picked up by the liquid.

By means of my invention the liquid and any air in the liquid is conducted into'and out of the cylinder by independent passages, thus insuring that liquid will pass through the cylinder during the bleeding operation. The bleeder passagethe passage between the cylinder and the exterioris opened and closed by means of the ried by the chamber conduit terminal, thus eliminating'the necessity for using a separate valve for the bleeder passage. A simple twist or the supply conduit connecting means is all that is necessary to control the bleeder passage.

Having fully described myinvention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a fluid supply and bleeding means for a fluid system, a fluid receiving chamber having an opening in its wall, a supply conduit, means removably connecting the supply conduit in fluidtight relation to the chamber opening whereby fluid will flow directly into the chamber, means forming a bleed passage between the chamber and the exterior for permitting fluid to flow from the chamber independently of the path of fluid flow from the supply conduit, and means for controlling the passage by the connecting means, said passage being closed when the connecting means 2 is in a position to maintain the conduit in fluidtight relation with the chamber and open when the connecting means is in a position where the conduit is connected to the chamber but not in fluid-tight relation. 2. In a fluid supply a d bleeding means fora fluid system, a fluid receiving chamber having an opening in its wall, a supply conduit,'means comprising cooperating screw-threaded elements carwall and the conduit for removably connecting the conduit in fluid-tight relation to the chamber opening whereby fluid will flow directly into the chamber, means forming a bleed passage between the chamber and the ex-- -terior and independent from the su ply conduit to the chamber, and meanscompr sing a portion or said connecting means for controlling said passagewhereby said passage will be closed when the threaded elements are in a position to maintain the conduit in fluidtight relation with the chamber and open when the threaded'elements are in another position where the conduit is maintained connected to the .chamber but not in fluid-tight relation.

3. In a fluid supply and bleeding means for a fluid system, a fluid receiving chamber having an opening in its wall, a fluid supply conduit,means for connecting the conduit to. the chamber and for sealing the conduit to the chamber opening, means forming a bleed passage between the chamber and the exterior and independent of the path of fluid flow from the supply conduit to the chamber, and means carried by the connecting means for closing said passage when the connecting means is in a position for sealing the conduit to the chamber opening and for opening the passage when the connecting means is in a position in which the conduit is unsealed with respect to the chamber.

4. In a fluid supply and bleeding means for a fluid system, a fluid receiving chamber having an opening in its wall, a fluid supply conduit provided with a shoulder, means'ior attaching said conduit to the chamber so that said shoulder will be in sealing engagement with the chamber wall, and means forming a bleed passage between the chamber and the exterior and independent of the path of fluid flow from the supply conduit to the chamber, said passage being closed when the shoulder is in sealing engagement with the 70 independent bleed passage for placing the cham- 7 9,054,658 her in communication with the exterior, the wall of said chamber being formed with an annular surface surrounding the outer ends oi. the opening and the passage, and a fluid supply conduit provided with a threaded extension for cooperation with the threaded opening and with a shoulder for sealing engagement with the annular surface on the chamber wall.

. 6. In a fluid system, a fluid receiving chamber provided with an opening in its wall and an annular surface surrounding said opening, a fluid supply conduit provided with a hollow extension 3 of smaller external diameter than said chamber opening and adapted to extend through said opening into the chamber, said conduit also being provided with a shoulder for engaging the annular surface, means for removably securing the con- 5 duit to the chamber wall whereby the shoulder and annular surface will be in sealing-engagement and means permitting communication between the chamber and the exterior when the shoulder and annular surface are moved out 01' lo sealing engagement. BURNS DICK. 

